Lee, M.Grillet, C.Smith, C.Moss, D.Eggleton, B.Freeman, D.Luther-Davies, B.Madden, S.Rode, A.Ruan, Y.Lee, Y.2008-05-062008-05-062007Optics Express, 2007; 15(3):1277-12851094-40871094-4087http://hdl.handle.net/2440/43254This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=oe-15-3-1277. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.We present experimental results on post-tuning the dispersion of a two-dimensional photonic crystal waveguide made from Ge(33)As(12)Se(55) chalcogenide glass by exploiting the material photosensitivity to near-bandgap light. The change in the refractive index and volume of the material in response to exposure to 633nm light resulted in a shift of more than 5nm in the resonant coupling wavelength between a tapered optical fiber and the modes of a W1 waveguide. This represents a first proof of principle demonstration of the photosensitive post-tuning of a planar photonic crystal device.en© 2007 Optical Society of AmericaJournal article002007033510.1364/OE.15.0012770002446822000592-s2.0-3384687238449127